The GVAA Rate Guide - aka my security blankie, when you have to negotiate rates for yourself it's crucial to have a guideline like this!
Marc Scott - a GREAT resource and well of knowledge. If you are on FB he does Free Advice Fridays you can hop on and ask questions, he posts podcasts and YT videos, tons of free stuff to get you going. Subscribe to his mailing list for podcast episodes and giveaway contests as well. Focuses on B2B marketing and more of the industrial/IVR/corporate narration side of things
The Voicecaster - tbh I only ever booked studio time there for sessions before I had certain abilities in my booth so I can't personally speak for their workshops/demos but they are a reputable studio so I'm sure they are at least good for beginners!
The Halp Academy - great classes with working professionals in videogame/animation in particular
Studio NPC - working professionals, workouts and lectures
Demos - base off of what genres you want to focus on. A lot of folx would argue with me but I say create your own to start. Find copy on iSpot for commercial, old cartoons for animation, pages from books for audiobook - or write your own! - it won't serve you long in your VO career but can get you going. Look up the VO's of your favorite programs and check out their websites and reels for examples but always start with where you are at.